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为了提高基于雪崩三极管级联的超宽带电磁脉冲源的输出功率,将其作为脉冲子源,提出对两路相同的脉冲子源进行功率合成,并分析了该脉冲子源的频率参数。根据输出脉冲宽频带、陡前沿的特点,利用ADS仿真软件对3节、4节和7节功率合成模块进行了仿真和优化设计,最终确定并研制了最优的3节功率合成模块。通过实际测试得出:在脉冲子源的工作频带内,其输入和输出端口回波损耗的最大值为–26 d B,传输损耗基本保持在–3.2 d B,输入端口间隔离度的最大值为–28 d B,该功率合成模块的仿真结果与实验验证基本一致。通过对比脉冲源原波形和合成后的输出波形可见,该功率合成模块可满足频带为200 MHz~1.2 GHz脉冲源的功率合成。
In order to improve the output power of ultra-wideband electromagnetic pulse source based on cascade connection of avalanche transistors, we propose to use the same pulse source as the pulsed sub-source, and then analyze the frequency parameters of the pulsed sub-source. According to the characteristics of broadband and steep frontier of output pulse, the power synthesis module of 3, 4 and 7 sections was simulated and optimized by ADS simulation software, finally the optimal 3-section power synthesis module was determined and developed. The practical test shows that the maximum return loss of the input and output ports is -26 d B and the transmission loss is maintained at -3.2 d B in the working frequency band of the pulse sub-source. The maximum value of the isolation between the input ports Is -28 d B, the simulation results of the power synthesis module are basically the same as the experimental verification. By comparing the original waveform of the pulse source and the synthesized output waveform, the power synthesis module can meet the power synthesis of a pulse source with a frequency band of 200 MHz to 1.2 GHz.